Description

In the Linux kernel, the following vulnerability has been resolved:

vfio/pci: Lock external INTx masking ops

Mask operations through config space changes to DisINTx may race INTx
configuration changes via ioctl. Create wrappers that add locking for
paths outside of the core interrupt code.

In particular, irq_type is updated holding igate, therefore testing
is_intx() requires holding igate. For example clearing DisINTx from
config space can otherwise race changes of the interrupt configuration.

This aligns interfaces which may trigger the INTx eventfd into two
camps, one side serialized by igate and the other only enabled while
INTx is configured. A subsequent patch introduces synchronization for
the latter flows.

Classification

CVE ID: CVE-2024-26810

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 15.26% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/1e71b6449d55179170efc8dee8664510bb813b42
https://git.kernel.org/stable/c/3dd9be6cb55e0f47544e7cdda486413f7134e3b3
https://git.kernel.org/stable/c/ec73e079729258a05452356cf6d098bf1504d5a6
https://git.kernel.org/stable/c/3fe0ac10bd117df847c93408a9d428a453cd60e5
https://git.kernel.org/stable/c/04a4a017b9ffd7b0f427b8c376688d14cb614651
https://git.kernel.org/stable/c/6fe478d855b20ac1eb5da724afe16af5a2aaaa40
https://git.kernel.org/stable/c/03505e3344b0576fd619416793a31eae9c5b73bf
https://git.kernel.org/stable/c/810cd4bb53456d0503cc4e7934e063835152c1b7

Timeline